ATmega1284 Atmel Corporation, ATmega1284 Datasheet - Page 53
ATmega1284
Manufacturer Part Number
ATmega1284
Description
Manufacturer
Atmel Corporation
Specifications of ATmega1284
Flash (kbytes)
128 Kbytes
Pin Count
44
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
16
Eeprom (bytes)
4096
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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11.1.4
11.1.5
8272C–AVR–06/11
Brown-out Detection
Watchdog Reset
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P has an On-chip Brown-out Detec-
tion (BOD) circuit for monitoring the V
level. The trigger level for the BOD can be selected by the BODLEVEL Fuses. The trigger level
has a hysteresis to ensure spike free Brown-out Detection. The hysteresis on the detection level
should be interpreted as V
When the BOD is enabled, and V
11-5 on page
trigger level (V
out period t
The BOD circuit will only detect a drop in V
ger than t
Figure 11-5. Brown-out Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
”Watchdog Timer” on page 55
Figure 11-6. Watchdog Reset During Operation
BOD
CC
TOUT
given in
53), the Brown-out Reset is immediately activated. When V
ATmega164A/PA/324A/PA/644A/PA/1284/P
BOT+
INTERNAL
TIME-OUT
has expired.
RESET
RESET
in
V
CC
Figure 11-5 on page
”System and Reset Characteristics” on page
BOT+
for details on operation of the Watchdog Timer.
= V
CC
BOT
decreases to a value below the trigger level (V
CC
V
CK
+ V
BOT-
level during operation by comparing it to a fixed trigger
HYST
53), the delay counter starts the MCU after the Time-
CC
/2 and V
if the voltage stays below the trigger level for lon-
BOT-
= V
V
t
TOUT
BOT
BOT+
- V
337.
HYST
CC
/2.
increases above the
TOUT
BOT-
. Refer to
in
Figure
53
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